Fixes #11917.  Refs #11043.  Constrain vertical slider position:relative on TD to just the middle row and fixup robot tests.
Fixes #11917.  Refs #11043.  Constrain vertical slider position:relative on TD to just the middle row and fixup robot tests.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@23099 560b804f-0ae3-0310-86f3-f6aa0a117693

kitsonk/delite,harbalk/delite,harbalk/delite,Sam-Cummins/delite,Sam-Cummins/delite,kitsonk/delite